Electric railroad-brake.



No. 745,285. PATENTED NOV. 24, 1903. J. S. LOGKWOOD.

ELECTRIC RAILROAD BRAKE.

' APPLICATION FILED APR. 21, 1903. N0 MODEL.

-WITNE5EE5: 4 Immmun No. 745,285 PATENTED 'NOV.24 ,1903.5

J. s. LOGKWOOD. ELECTRIC RAILROAD BRAKE.

APPLICATION FILED APR. 21, 1903.

2 SHEETSSHEEVT z. 1

N0 MODEL.

WITNESSES 4o Y of a modified form of my invention in which UNITED STATESPatented November 24, 1903.

JOHN S. LOOKWOOD, OF KANSAS CITY, MISSOURI.

ELECTRIC RAILROAD-BRAKE.

SPECIFICATION forming part of Letters Patent No. 745,285, dated November24, 1903.

Application filed April 21 1903. Serial No. 153 ,605. (No model.)

To all whom it may concern.-

Be it known that I, JOHN S. LOCKWOOD, a citizen of the United Statesof'America, residing in Kansas City, in the county of Jackson and Stateof Missouri, have invented a new and useful Improvement in ElectricRailroad-Brakes, of which the following is a specification, referencebeing had therein to the accompanying drawings, forming a part thereof.

My invention relates to electric railroadbrakes. I

The object of my invention is to provide an electric brake in which therail and wheel shoes are simultaneously actuated by the sameelectromagnetic force.

My invention provides, further, an electric brake in which a singlehelix controls the actuating of the rail and wheel shoes.-

My invention provides, further, a rail-shoe magnetizable by a helix, amagnetizable core movable by said helix, and means by which movement ofthe core applies the wheel-shoe to the wheel.

My invention provides, further, means by.

which excessive braking pressure of the wheel-shoes on the wheel isprevented.

My invention provides, further, aconstrnction of electric brakes whichis powerful in action, simple in construction, and having greatstrength.

Other novel features are hereinafter fully described and claimed;

In the accompanying drawings, which illustrate my invention, Figure 1 isa View, partly in vertical section and partly in side elevation, of oneform of my invention in which a plurality of helices are employed. Fig.2 is a cross-section taken on the dotted line a b of Fig. 1. Fig. 3 is aside elevation View a single helix is utilized for actuating thebrake-shoes. Fig. 4 is a view of another form of my invention shownpartly in side elevation and partly in section. In this form of myinvention another form of rail-shoesupporting means is shown. Fig. 5 isa horizontal section taken on the dotted line 0 cl of Fig. 4, some ofthe parts being broken away.

Similar characters of reference indicate similar parts. I

1 indicates the rail; 2, the car-wheels; 3,

ward andffrom the rail 1.

. truck-frame between the car-wheels.

Referring particularly to Figs. 1 and 2, 7 indicates a U-shapedrail-shoe of a magnetizablematerial, the vertical stems 8 of which aremovable in the. supportingframe 6 to- Two helices 9 encircle the twostems 8, respectively. Ahelix 1O encircles the horizontal portion of therail-shoe. The helix 10 is connected in series with the helices 9, andthe helices are so wound as to magnetize the stems of the railshoeoppositely. At each end of the rail-shoe is provide'd'a projection 11,from the upper side of which extends a vertical rod '12, verti callymovable in a hole provided in the frame 6. The upper end of each of therods 12 is screw-threaded and has mounted thereon a nut 13. Encirclingeach of the rods 12 is a coilspring 14:, the lower end of which restsupon the frame 6 and the upper end bearing against the nut 13. Thetension of the springs 14 is such that the rail-shoe will be normallyraised above the rail. Any suitable means may be employed for energizingthe helices 9 and 10. The upper ends of the stems 8 are tubular, and ineach of said stems is vertically movable a magnetizable core 15. The twocores are connected with each other by a horizontal yoke 16, having itsends pivotally connected to the two cores. In each arm 5 is provided atransverse hole in which is longitudinally movable a bolt 17,screw-threaded at one end and having mounted thereon and bearing againstthe arms 5 a nut 18. Theother end of the bolt 17 is provided with an eye19, to which is connected one end of a coil-spring 20, the other end ofwhich is connected to one end of a cord or chain 21, which passes over apulley 22, supported from the under side of the truck-frame 3"above oneof thecores 15, T

and is connected at the other end to the said core. The strength of thespring 20 and the loo of the hole in the stem. This predeterminedpressure is such that the wheel-shoes will not be applied with forceenough to lock the wheels and cause them to slide. By adjustment of thenuts 18 the tension of springs 20 may be varied. In operating this formof my invention when it is desired to apply the brakes current isapplied to the helices 9 and 10, which will then energize the stems 8 ofthe rail-shoe 7, thus causing the rail-shoe to be attracted toward therail against the pressure of the springs 14. At the same time the cores15 will be drawn downward lengthwise in the helices 9, thus swinging theWheelshoes 4 against the wheels 2 through the intervention of the chainor rope 21, springs 20, and arms 5. The tension of the springs 20 issuch that the cores 15 will strike the bottoms of the holes in the stems8 before pressure enough is applied to the shoes to cause the wheels tobe locked. As soon as the currentis out off the helices 9 and 10 thesprings 14 will raise the rail-shoe from the rail and magnetic suctionof the cores 15 will cease.

i In the form of my invention shown in Fig. 3 a single helix 9 ismounted on the frame 6. The shoe (indicated by 23) is provided with twovertical rods 12 and nuts 13 and coil springs 14, as in the form shownin Fig. 1. The single core .15 is mounted as described with reference tothe cores in the form shown in Fig. 1. The core 15 is connected to thetwo chains or ropes 21, which are connected to the brake-arms, asalready described.

In the form of my invention shown in Figs. 4 and 5 the rail-shoe isformed similarly to the one 23 shown in Fig. 3. In this form of myinvention the brake-shoe 23 has pivotally connected to it at itsrespective ends the lower ends of two links 24, the upper ends of whichare respectively pivoted to the lower endsof two links 25, theupper endsof which are pivotally secured to the frame 6. '26 indicates twosprings, the lower, ends of which are respectively secured to the upperend of the links 24, the upper ends of the springs being secured to theframe 6. The tension of the springs 26 is such that the links 24 and 25are forced into the position shown in solid lines in Fig. 4, thusnormally retaining the rail-shoe 23 above the rail. The core 15,vertically movable in the tubular upper end of the stem 8, has securedto it the lower end of a coil-spring 27, the upper end of which issecured to a transverse bar 28, pivotally secured at its respective endsto the lower ends of two vertical bars 29, the upper ends of which arepivotally connected with the inner ends of two downwardly and outwardlyinclined arms 30, the outer ends of which are pivoted, respectively, oneto each wheel-shoe 4. The inner ends of the arms 30 are arouate in formand hear one upon the other. The

strength and tension of the spring 27 are such that the core 15 willcome to rest before the brake-shoes have been applied to the wheels withsulhcient force to lock the wheels. In operating this form of myinvention when the electric current is sent through the helix 9 the shoe23 will become magnetized and drawn by magnetic attraction against therail 1, throwing the links 24 and 25 into the position indicated indotted lines in Fig. 4. At the same time the core 15 will be drawndownward, thus swinging downward the inner ends of the arms 30, which inturn will force the brake-shoes 4 against the car-wheels 2. As soon-asthe current is cutoff from the helix 9 the rail-shoe 23, beingdemagnetized, will be raised from the rail by the coil-springs 26.

My invention may be variously modified without departing from itsspirit.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is-- 1. In electric brakes of the kind described, thecombination with a magnetic rail-shoe, of a helix for magnetizing therail-shoe, the wheel-shoe, a magnetizable body magnetizahle by andmovable toward and from the said helix, and means by which thewheel-shoe is applied to the wheel when the said magnetizable body isproperly moved.

2. In electric brakes, the combination with a magnetic rail-shoe, of ahelix for magnetizing the railshoe, the wheel-shoe, a body magnetizableby and movable toward and from the said helix, means for normallyretaining the rail-shoe clear of the rail when the railshoe isdemagnetized, and means by which the wheel-shoe is applied to the wheelwhen the said magnetizable body is properly moved.

3. In electric brakes, the combination with a magnetic rail-shoe, of ahelix for magnetizing the same, the wheel-shoe, means by which the saidhelix applies the wheel-shoe to the 'wheel, and means by which excessivepressure of the Wheel-shoe on the wheel is prevented.

4. In electric brakes, the combination with a magnetic rail-shoe, of ahelix for magnetizing the same, means for clearing the rail-shoe fromthe rail when the shoe is demagnetized, the wheel-shoe, means by whichthe wheelshoe is applied to the wheel when the helix is charged, andmeans for regulating the pressure applied by the wheel-shoe to theWheel.

5. In electric brakes, the combination with the rail-shoe, of a helixfor magnetizing the same, a magnetizable core movable lengthwise in saidhelix, the wheel-shoe, and means for applying the wheel-shoe to thewheel when the core is magnetized by the helix.

6. In electric brakes, the combination with the rail-shoe, of the helixfor magnetizing the same,a magnetizable core movable lengthwise in saidhelix, the wheelshoe, means for applying the wheel-shoe to the wheelwhen the core is magnetized, and means for limiting the pressure appliedby the wheel-shoe to the wheel.

7. In electric brakes, the combination with the rail-shoe, of a helixfor magnetizing the same,a magnetizable core movable lengthwise in saidhelix, the wheel-shoe, means for applying the wheel-shoe to the wheelwhen the core is magnetized, and adjustable means for varying the degreeof pressure of the wheelshoe.

8. In electric brakes, the combination with therail-shoe movable towardand from the rail, of the helix for magnetizing the railshoe, amagnetizable core movable lengthwise in said helix, the wheel-shoe,means for applying the wheel-shoe to the wheel when the core ismagnetized, and adjustable means for varying the degree of pressure ofthe wheelshoe.

9. In electric brakes, the combination with the rail-shoe provided witha magnetizable stem, of a helix encircling said stem, a magnetizablecore adapted to enter said helix when the helix is energized, thewheel-shoe, and means by which movement of the core applies thewheel-shoe to the wheel.

10. In electric brakes, the combination with a magnetizable rail-shoeprovided with a magnetizable stem, of a helix encircling said stem, amagnetizable core adapted to be moved lengthwise in said helix, thewheel shoe, means by which the wheel-shoe is applied to the wheel whenthe core is magnetized by the helix, and means for limiting the degreeof pressure of the wheel-shoe on the wheel.

11. In electric brakes, the combination with the magnetizable rail-shoeprovided with a magnetizable stem, of a helix encircling the said stem,a magnetizable core movable lengthwise in said helix, the wheel shoe,means by which the wheel-shoe is applied to the wheel when the core ismagnetized by the helix, and means for withdrawing the railshoe from therail when the rail-shoe is demagnetized.

12. In electric brakes, the combination with the magnetizable rail-shoeprovided with a magnetizable stem, of a helix encircling said stem, amagnetizable core movable lengthwise in said helix, a wheel-shoe, aspring connected to said wheel-shoe and to said core, and means by whichthe tension of said spring may be varied.

13. In electric brakes, the combination with a magnetizable rail-shoemovable toward and from the rail, of a spring for withdrawing therail-shoe from the rail, a helix for magnetizing the rail-shoe, amagnetizable core movable by said helix, a wheel-shoe and means by whichthe wheel-shoe is applied to the wheel when the said core is magnetizedby the helix.

14. In electric-car brakes, the combination with amagnetizablerail-shoe, of a helix for magnetizing the same, a magnetizable bodymovable toward and from the said helix, a pivotally-mounted wheel-shoe,and means for swinging the said wheel shoe against the wheel when thesaid magnetizable body is moved toward the said helix.

15. In electric brakes, the combination with a magnetizable rail-shoe,of a helix for magnetizing the same, a magnetizable body movable towardand from the said helix, a pivotally-mounted wheel-shoe, a springconnected therewith and to the said magnetizable body.

16. In electric brakes, the combination with a magnetizable rail-shoe,of a helix for magnetizing the same, a magnetizable core movablelengthwise in said helix, a pivotallymounted wheel-shoe, a springconnected to the wheel-shoe and to the said core.

17. In electric brakes, the combination with a magnetizable rail-shoe,of a helix for magnetizing the same, a magnetizable body movable towardand from the said helix, means for limiting the movement of the saidbody toward the said helix, a wheel-shoe, and a spring connected to saidshoe and to the said magnetizable body.

18. In electric brakes, the combination with a magnetizable rail-shoe,of a helix for magnetizing the same, a magnetizable core movablelengthwise in said helix, means for limiting the movement of the saidcore into said helix, a wheel-shoe, and a spring connected with saidwheel-shoe and the said core.

19. In electric brakes, the combination with a helix,of a magn etizablecore movable lengthwise therein, a wheel-shoe movable toward and-fromthe wheel, a spring and means by which movement of the said coreisimparted to the wheel-shoe through said spring.

20. In electric brakes, the combination with a helix,of a magnetizablecore movable lengthwise therein, a wheel-shoe movable toward and fromthe wheel, a spring, means by which movement of the said core isimparted to the wheel-shoe through said spring, and means for varyingthe tension of said spring.

21. In electric brakes, the combination with a helix, of a magnetizablebody movable toward and from the said helix, a wheel-shoe movable towardand from the wheel, a spring, means by which movement of the saidmagnetizable body is imparted to the wheel-shoe through said spring, andmeans for limiting the movement of the said magnetizable body towardsaid helix.

22. In electric brakes, the combination with a helix, of a magnetizablebody movable toward and from the said helix, a wheel-shoe movable towardand from the wheel, a spring, means by which movement of the saidmagnetizable body is imparted to the wheel-shoe through said spring,means for limiting the movement of the said magnetizable body towardsaid helix, and means for varying the tension of said spring.

23. In electric brakes, the combination with a magnetizable body movabletoward and from the said helix, and means for actuating the saidwheel-shoes when the said magnetizable body is properlymoved.

24. In electric brakes, the combination with a a magnetizable rail-shoe,of a helix for magnetizing the same, a magnetizable core mov- ICO IIO

able lengthwise in said helix, a plurality of wheel-shoes, and means foractuating the same when the core is properly moved.

25. In electric brakes, the combination with a magnetic rail-shoe, of ahelix for magnetizing the same, a magnetizable core movable lengthwiseinsaid helix, a plurality of wheelshoes, and adjustable means foractuating the wheel-shoes when the said core is properly moved.

26. In electric brakes, the combination with a magnetic rail-shoe, of ahelix for magnetizing the same, a magnetizable core movable lengthwisein said helix, a plurality of wheelshoes, means by which the wheel-shoesare actuated when the said core is moved inwardly in said helix, thesaid wheel-shoe-actuating means being provided with means for limitingthe pressure applied by said wheelshoes.

27. In electric brakes, the combination with a magnetizable rail-shoe,of a plurality of helices, a magnetizable device actuated by and movabletoward and from the said helices, a plurality of wheel-shoes, and meansfor actuating the said wheel-shoes when the said magnetizable device ismagnetized by the said helices.

28. In electric brakes, the combination with a magnetizable rail-shoe,of a plurality of helices for magnetizing the same, a plurality ofmagnetizable cores movable length wise one in each of said helices, aplurality of wheel-shoes and means for actuating the same, when the saidcores are magnetized.

29. In electric brakes, the combination with a magnetizable rail-shoe,of a plurality of helices for magnetizing the same, a plurality ofmagnetizable cores movable lengthwise one in each of said helices,aplurality of wheel-shoes, adjustable means for actuating the saidWheelshoes when the said magnetizable cores are moved inwardly in saidhelices, the said adjustable means being provided with means by whichexcessive pressure of the wheel-shoes is prevented.

30. In electric brakes, the combination with a magnetizable rail-shoe,of two helices for magnetizing the same,two magnetizable cores movablelengthwise one in each of said helices, two wheel-shoes, and two springsconnected respectively to the said cores and the said wheel-shoes.

31. In electric brakes, the combination with a magnetizable rail-shoe,of two helices for magnetizing the same, two cores movable lengthwiseone in each of said helices, and magnetizable thereby, a magnetizableyoke connecting the two said cores, a plurality of wheel-shoes, andmeansby which the wheelshoes are actuated when the cores are moved in thesaid helices.

32. In electric brakes, the combination with a magnetizable rail-shoe,provided with two magnetizable stems, of a support in which the saidstems are movable toward and from the rail, two helices encircling oneeach the said "stems,two magnetizable cores movable lengthwise one ineach of said helices, a plurality of wheel-shoes and means by which thesaid wheel-shoes are actuated when the cores are properly moved.

33. In electric brakes, the combination with a magnetizable rail-shoe,ofa plurality of helices for magnetizing the same, two magnetizablecores movable lengthwise in two of said helices, a magnetizable yokeconnecting the two said cores, a plurality of wheel-shoes, and means foractuating the same when the cores are properly moved.

34. The combination with a magnetizable rail-shoe, of a plurality ofhelices for magnetizing the same, two cores movable lengthwise in andmagnetizable by two of said helices respectively, a magnetizable yokeconnecting the two said cores, a plurality of wheelshoes, and means bywhich'the wheelshoes are applied to the Wheels with a predetermineddegree of force when the cores are properly moved.

In testimony whereof I have signed my name to this specification inpresence of two subscribing witnesses.

JOHN S. LOOKWOOD.

Witnesses:

WARREN D. I-IoUsE,

HENRY F. Ross.

